CN102726016B - For equipment and the method for channel estimating in wireless communication system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/022—Channel estimation of frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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Abstract
Example embodiment of the present invention relates to subscriber equipment for channel estimating in wireless communication network system and method.Described method comprises: receive Physical Resource Block from radio base station; Estimate the channel coefficients of the Physical Resource Block of each reception; For the difference between the channel coefficients that every two contiguous physical Resource Block calculate the estimation of these two contiguous physical Resource Block; More each difference and predefine threshold value; Difference described in it will be less than or equal to the Physical Resource Block marshalling of predefined threshold value; And the channel estimating performed adaptively in groups and the channel estimating by Physical Resource Block.
Description
Technical field
The present invention relates generally to the field of wireless communication system, and more particularly, relate to the equipment for channel estimating in wireless communication system and method.
Background technology
Third generation partner program (3GPP) is responsible for the service of UMTS(universal mobile telecommunications) standardization of system, and LTE(Long Term Evolution) current the next generation mobile communication system as UMTS system is being discussed.LTE is a kind of technology for realizing packet-based high-speed communication, and this communication all can reach High Data Rate in the downlink and in the uplink.About the 3GPP work of LTE is also referred to as E-UTRAN(Evolved Universal Terrestrial access network).Therefore, as a part for LTE work, the work of the evolution (being expressed as E-UTRA) being assigned to UTRAN is just being carried out in 3 gpp.Be called that the first distribution version of the LTE of distribution version 8 (Rel-8) can provide that the radio net of the peak rate of 300Mbps, such as 5ms or lower postpones, the significantly increase of spectrum efficiency aspect and be designed to simplified network operation, the network architecture etc. reduced costs.In order to support High Data Rate, LTE allows the system bandwidth up to 20MHz.LTE also can operate in different frequency bands, and can at least FDD(Frequency Division Duplexing (FDD)) and TDD(time division duplex) in operation.The modulation technique used in LTE or transfer scheme are called OFDM(OFDM).
For next generation mobile communication system, such as, IMT-advanced(international mobile telecommunication) and/or LTE-advanced(it be the evolution of LTE), the support to the bandwidth up to 100MHz is being discussed.The relevant problem of this type of wide bandwidth is, because radio spectrum is limited resource, therefore, the continuous spectrum searching idle 100MHz is challenging.
LTE-advanced can be considered as being future of LTE standard issue version, and due to it be the evolution of LTE, therefore, backwards compatibility is important, so that LTE-advanced can be deployed in the spectrum that LTE taken.This means for LTE subscriber equipment or LTE terminal, the network of tool LTE-advanced ability can seem as LTE network.Be called that eNB or eNodeB(is wherein, e represents evolution) LTE and LTE-advanced radio base station in, multiple antenna with beam-forming technology can be adopted to provide High Data Rate to subscriber equipment.Therefore, LTE and LTE-advanced is MIMO(multiple-input and multiple-output) example of radio system.Another example based on the system of MIMO is WiMAX(inserting of microwave worldwide interoperability) system.
Based in the system of MIMO, Wave beam forming or precoding are for supporting multilayer transmission.Among other features, precoding relate to concentrating transmit the power of antenna and direction to improve the SNR(signal to noise ratio of perception) or the SNR(Signal Interference and Noise Ratio of perception), and performance in therefore raising system and throughput.Precoding can be categorized as the precoding based on code book and non-code book.Precoding (it can be used for LTEFDD) based on code book has been introduced into so that minimum feedback expense, and feedback link (i.e. up link) from subscriber equipment to radio base station is as without well-designed, and feedback overhead can be quite large.Code book is the predetermined set of pre-coding matrix, and wherein, each pre-coding matrix is by PMI(pre-coding matrix index (or designator)) identify.Therefore, when the foundation of user equipment requests channel and the connection with radio base station, the quality of channel estimated by subscriber equipment, and subscriber equipment does not feed back channel matrix completely to radio base station, and only selects and beam back the index of optimal pre-coding matrix in code book.Like this, feedback overhead is reduced.
For the precoding (or Wave beam forming) based on non-code book, radio base station is not confined to the predefine Resource selection pre-coding matrix from pre-coding matrix, but can then utilize channel reciprocity, from obtain from up link transmit channel estimating to adjust down link transmit weight.Broadband CRS(public reference signal except for channel measurement) except, the example that up link transmits comprises also for the subscriber equipment DRS(DRS (Dedicated Reference Signal) of rapid data demodulation).Because DRS is by user equipment specific, therefore, DRS is assigned at radio base station in the Physical Resource Block (PRB) of the distribution/appointment of subscriber equipment and is carried.In addition, different from the precoding based on code book, when the precoding based on non-code book, subscriber equipment carries out the estimation of the channel of overall Wave beam forming.In order to realize this, LTE such as provides the possibility of the transmission of subscriber equipment reference symbol, and reference symbol and user data use same beam to be formed to transmit and allow subscriber equipment to estimate the channel of overall Wave beam forming.Another aspect of this operation is by the constraint of quantity of available cell specific reference signals for the quantity of the transmission antenna of the precoding based on non-code book.
Should it is mentioned that, based in the pre-coding system of code book, broadband CRS is used from data demodulates with the PMI mono-notified through downlink control signaling by radio base station.Therefore, subscriber equipment has the different demodulation strategies depending on pre-coding scheme.Be respectively used to two kinds of precodings and the such as RI(order designator of CRS and DRS shown in the table 1 of Fig. 1), PMI and CQI(CQI) etc. the comparison that is associated between report index/designator.Noting, when using the precoding based on code book, not carrying DRS.
Mentioned by more early, for the precoding based on non-code book, perform channel estimating based on the DRS in the PRB distributed.But because subscriber equipment lacks the knowledge about precoding granularity, the simplest strategy performs the channel estimating by PBR, and this is also employed in current standardized assessment.Fig. 2 is the example of the general categories illustrated in the channel estimating of the precoding based on non-code book.As shown in the figure, according to the scheduling strategy of radio base station (being exemplarily expressed as eNB herein), each subframe comprises the every subframe of PRB(and 6 PRB is shown), and each PRB experience is shown for W
idownlink precoding device (Wave beam forming), and each subframe has different precoding granularities.Exemplarily, the PRB#1 of subframe 1 experiences downlink precoding device W
1, PRB#2 and PRB#3 of identical subframe #1 transfers experience downlink precoding device W
2; PRB#1 and PRB#2 of subframe #2 experiences precoder W
1, and PRB#3 and PRB#4 of subframe #2 experiences precoder W
2etc..As shown in the figure, by the channel estimating strategy that PRB execution subscriber equipment (UE) applies.As shown in the figure, in time and frequency domain, subframe is dispatched.
With reference to Fig. 3 A-3B, expand Typical Urban at two ETU(shown in figure) in situation for layer beam formed Performance Evaluation when the channel estimating of PRB is pressed in execution (, emulation), in the first situation (Fig. 3 A), the speed of UE is 3km/h, and in second case (Fig. 3 B), the speed of UE is 120km/h.It is also the performance that two kinds of situations illustrate perfect channel estimation.Which curve is legend in respective graphical indicate relevant with perfect channel estimation, and which curve is estimated relevant with the realistic channels for ETU situation.Emulating display as SNR(in units of dB) the BLER(block error rate of function).Through emulation, use the precoding granularity of 4 PRB.In addition, the UE channel estimator of use uses two-dimentional MMSE filter (2D-MMSE) based on the criterion of least mean-square error (MMSE).In addition, consider 3 kinds of modulation schemes: QPSK(Quadrature Phase Shift Keying), 16QAM(quadrature amplitude modulation) and 64QAM; And be the same-code speed that the application of all modulation schemes equals 1/2.As shown in the figure, regardless of ETU situation, perfect channel estimation and the realistic channels by PRB estimate between gap be large.Fig. 3 A-3B centre circle has shown gap.Modulation scheme is higher, and the mobility of subscriber equipment or speed higher, gap is larger.This is because such as 64QAM etc. more high modulation is more responsive to channel errors.Therefore, be Fig. 3 A of 3km/h with reference to its medium velocity, can it is seen that, for 64QAM, for ideal communication channel, when SNR equals 13dB, BLER is approximately 20%.For identical 64QAM with for identical SNR value, for realistic channels, BLER is approximately 45%.With reference to Fig. 3 B that its medium velocity is 120km/h, can it is seen that, for 64QAM, for ideal communication channel, when SNR equals 13dB, BLER is approximately 50%.For identical 64QAM with for identical SNR value, for realistic channels, BLER is approximately 90%.
Therefore, the shortcoming adopting normal channel estimation scheme is that the demodulation performance of Wave beam forming and the performance of system are away from ideal performance usually, particularly for more high modulation scheme.
Summary of the invention
Therefore the object of example embodiment of the present invention is the equipment of method by being provided for channel estimating and subscriber equipment (UE) or user terminal form, performance in the wireless communication system of its improvement support Wave beam forming and channel estimation accuracy, thus solve the problem.
According to the one side of example embodiment of the present invention, the problems referred to above are solved by means of a kind of UE for the channel estimating in wireless communication network system, and this UE comprises the acceptor circuit being configured to receive multiple PRB from radio base station.This UE also comprises: channel estimator, is configured to the channel coefficients estimating each PRB; Computer circuits, is configured as the difference between channel coefficients that every two adjacent PRB calculate the estimation of these two adjacent PRB; Comparator circuit, is configured to difference and the predefine threshold value of more each calculating; Assembler circuit, is configured to the PRB marshalling difference calculated for it being less than or equal to predefine threshold value; And channel estimator is also configured to comprising the channel estimating that the group difference calculated described in it being less than or equal to the PRB of predefine threshold value performs in groups (namely, in groups or channel estimating between PRB), and on each residue Physical Resource Block, also perform the channel estimating of pressing PRB.
According to the another aspect of example embodiment of the present invention, the problems referred to above are solved for the method for the channel estimating in wireless communication network system in UE by means of a kind of.The method comprises: receive multiple continuous P RB from radio base station; Estimate the channel coefficients of the PRB of each reception; For the difference between the channel coefficients that every two adjacent PRB calculate the estimation of these two adjacent PRB; More each difference and predefine threshold value; Its difference will be less than or equal to the PRB marshalling of predefine threshold value; Comprising the channel estimating for group being less than or equal to the PRB of predefine threshold value poor described in it performing in groups, and performing the estimation of pressing PRB on each residue PRB.
The advantage of example embodiment of the present invention improves channel estimation accuracy.
Another advantage of example embodiment of the present invention improves the performance of wireless communication system.
Another advantage that example embodiment of the present invention still has is the low-complexity realization realizing channel estimating strategy at UE.
The another advantage of example embodiment of the present invention is any control signal realizing self adaptation transformation and notify to UE without the need to radio base station between channel estimating strategy.
From being described below in detail together with accompanying drawing, other advantage, object and feature that example embodiment of the present invention still has will become obvious, but, it should be noted that following figure is illustrative, and in the specific embodiment illustrated, various amendment and change can be carried out, as described in the scope of claim of enclosing.
Accompanying drawing explanation
Fig. 1 illustrates two kinds of pre-coding schemes and the table of the demodulation/channel measurement strategy that is associated.
Fig. 2 illustrates former radio base station scheduling strategy and prior art UE channel estimating strategy.
Fig. 3 A illustrate in the first situation perfect channel estimation and by PRB channel estimating between prior art Performance comparision.
Fig. 3 B illustrate in second case perfect channel estimation and by PRB channel estimating between prior art Performance comparision.
Fig. 4 is the block diagram of the subscriber equipment illustrated according to example embodiment of the present invention.
Fig. 5 illustrates prior art UE channel estimating strategy and the UE channel estimating strategy according to an example embodiment of the present invention.
Fig. 6 illustrates the example of the channel estimating strategy based on demonstration continuity criterion according to an example embodiment of the present invention.
Fig. 7 illustrates the comparison of the Exemplary channel coefficient in the belt edge for channel estimating according to an example embodiment of the present invention.
Fig. 8 A is that an example case illustrates that an example embodiment according to the present invention is at perfect channel estimation, by the Performance comparision between the channel estimating of PRB and adaptive channel estimation.
Fig. 8 B is that another example case illustrates that an example embodiment according to the present invention is at perfect channel estimation, by the Performance comparision between the channel estimating of PRB and adaptive channel estimation.
Fig. 9 illustrates the figure of the flow chart of method for using in a user device according to example embodiment of the present invention.
Embodiment
In the following description, in order to the object explained instead of limit, set forth specific details, as specific framework, situation, technology etc., to provide detailed understanding of the present invention.But the present invention and embodiment can be put into practice in other embodiment departing from these specific detail.
Example embodiment of the present invention is described by referring to particular example network system in this article.Specifically, the present invention describes in the non-limiting general context relevant with broadband system, wherein, based on LTE(LTE and/or LTE-advanced) radio base station (i.e. eNodeB(or eNB)) and UE be configured to support precoding (that is, Wave beam forming).It should be noted that the present invention and example embodiment thereof also may be used on adopting the radio base station and UE that are deployed in wherein and support radio net technology and the framework of other type of Wave beam forming (that is, precoding).
Example embodiment of the present invention relates to the UE being configured to perform channel estimating based on the Physical Resource Block (PRB) received from the radio base station (such as, the eNB of LTE) being applicable to support precoding (that is, Wave beam forming).ENB can be considered as the eNB based on MIMO, and therefore this eNB supports multilayer transmission, i.e. multiple transfer mode.ENB supports the precoding based on non-code book, and be not therefore confined to from the predefine set of pre-coding matrix to select pre-coding matrix, but can then utilize channel reciprocity, from obtain from up link transmit channel estimating to adjust down link transmit weight.Broadband CRS(public reference signal except for channel measurement) except, the example that up link transmits comprises also for the UEDRS(DRS (Dedicated Reference Signal) of rapid data demodulation).Because DRS is special by UE, therefore, DRS is assigned at eNB in the PRB of UE and is carried.But, it should be noted that eNB also can support the precoding based on code book of the predetermined set using pre-coding matrix.It shall yet further be noted that and issue in version 8 at LTE, by the single port DRS for demodulation, support individual layer Wave beam forming, and issue in version 9 at LTE, by the dual-port DRS for demodulation, support maximum two-layer transmission.But, example embodiment of the present invention is not limited to LTE, and is not limited to any specific quantity in radio base station side or the mimo antenna in UE side.
In the following description, consider be configured to scheduling resource to UE for the radio base station support making UE can carry out communicating with radio base station at least based on the exemplary scenario of the precoding of non-code book.Be applicable to assign or distribute the multiple continuous subframes comprising PRB at the scheduler of radio base station, these PRB are considered to continuous print herein.Scheduler can apply dynamic or static any applicable scheduling strategy.Transmitted by down link and assign towards UE notice.As mentioned above, radio base station is the radio base station based on MIMO.For this reason, radio base station comprises the multiple transceivers utilizing precoder to be formed with application of beam.UE also can be configured by combine for Wave beam forming with for allowing several antenna of carrying out with radio base station communicating in uplink direction and precoder to support MIMO.When UE is from radio base station Received signal strength (data or control), UE is configured to perform channel estimating on the received signal and back reports so that radio base station has the knowledge that signal propagates the communication channel passed through to radio base station.
With reference to Fig. 4, shown block diagram illustrates the UE400 according to example embodiment more of the present invention.UE400 shows to be comprise being connected to receiver/conveyer (also referred to as transceiver) 405(it being connected to input unit 420 through bus 430) two antennas 431,432(but be not required), output device 425, memory 415 and treatment circuit 410.Antenna 431,432 can comprise one or more antenna to be transmitted and/or received RF (RF) signal by aerial.Antenna 431,432 such as can receive RF signal from transceiver 405, by RF signal being sent to radio base station (not shown) in the air, and by receiving RF signal from radio base station in the air, and RF signal is provided to transceiver 405.Antenna 431,432 and transceiver 405 combine and are therefore configured to receive through at least one antenna 431 and/or antenna 432 PRB assigning/distribute as previously described.Transceiver 405 serves as receiver in this case.
According to an example embodiment of the present invention, the PRB that UE400 is configured to based on receiving performs channel estimating.For this reason, UE400 comprise be configured as each reception PRB estimate be expressed as herein
h k channel coefficients channel estimator 405A(such as, channel estimator circuit), wherein,
k=1,2,3,4 .. represents PRB index.In other words, channel estimator 405A is applicable to perform the channel estimating by PRB.UE400 can store the channel coefficients of estimation in memory (or memory circuitry) 415.
Every two adjacent PRB, computer circuits 405B are applicable to the difference calculated between the channel coefficients of these two adjacent PRB.Described difference is given:
,
k=1,2,3,4 .., wherein,
represent absolute value operators.
Exemplarily, for the PRB that four receive, channel estimator 405A is configured to determine:
h 1represent the channel coefficients of the estimation of PRB#1;
h 2represent the channel coefficients of the estimation of the PRB#2 adjacent with PRB#1;
h 3represent the channel coefficients of the estimation of the PRB#3 adjacent with PRB#2; And
h 4represent the channel coefficients of the estimation of the PRB#4 adjacent with PRB#3.It is poor that computer circuits 405B is configured to determine subsequently
with
.UE400 also comprises and is configured to more each difference
with show for
t h predefine or the comparator circuit 405C of predetermined threshold.After the comparison, UE400 is also configured to according to the following stated, performs its difference calculated be less than or equal to predefine threshold value by means of assembler circuit 405D
t h the assembling of PRB or grouping procedures:
?
time, marshalling the in a Was Used group
kindividual and (
k+ 1) individual PRB.
?
time, the
kindividual PRB is not organized into groups, or an element set.
The similar operations of other PRB.
PRB can be organized into groups in frequency domain and/or in the time domain.PRB is therefore, it is possible to be distributed in different groups according at least one criterion.According to an example embodiment of the present invention, useful criterion be by with predefine CSI threshold value
t h relatively, whether the continuity investigating channel condition information (CSI) between adjacent PRB is kept.In other words, the PRB marshalling of continuous CSI will be had in frequency and/or time-domain, otherwise will be distributed them.This can be considered as the continuity criterion based on predefine CSI threshold value.Note, predefine threshold value
t h it is the design parameter can determined by emulating or assessing, based on system or network requirement.In other words, example embodiment of the present invention is never limited to threshold value
t h any particular value.Be also noted that, example embodiment of the present invention is not limited to CSI.Exemplarily, criterion can be whether the difference of channel coefficients that investigation corresponds to the estimation of the SNR estimated meets predetermined SNR threshold value; Or whether the difference that investigation corresponds to the channel coefficients of the estimation of the SINR estimated meets predetermined SINR threshold value; Or investigation corresponds to the RSSI(received signal strength indicator symbol estimated) the difference of channel coefficients of estimation whether meet predetermined RSSI threshold value, or whether the difference of channel coefficients that investigation corresponds to the estimation of the BLER estimated meets predetermined BLER threshold value, or whether the difference that investigation corresponds to the channel coefficients of the estimation of the performance Associated channel coefficients of any estimation meets predefine threshold value.The advantage of use continuity criterion described above is that it provides low-complexity to realize in UE400.
After the comparison and marshalling of PRB, what UE400 was configured to it to be less than or equal to predefine threshold value by means of channel estimator 405A in the difference of calculating of the channel coefficients of the estimation of the PRB of group often organizes channel estimating PRB performed in groups.Channel estimator 405A is also configured to the channel estimating performed on each residue PRB by PRB.In this way, adaptive channel estimation strategy is implemented, because according to example embodiment of the present invention, UE400 can self adaptation be also expressed as channel estimating between PRB PRB channel estimating in groups and by the channel estimating of PRB between change, and this operation execution without the need to relating to any control signal from radio base station.Note, the different masses of transceiver 405 is not necessarily in transceiver block 405, that is, they can be bonded in processor or treatment circuit, or in circuit in any applicable assembly or circuit or UE hardware aspect and/or software.
Channel estimating strategy with reference to prior art shown in Fig. 5, figure compares the example of the adaptive channel estimation strategy performed by above-mentioned example embodiment of the present invention.As shown in the figure, prior art channel estimating strategy performs by PRB, and performed by the self-adaptive grouping for channel estimating as described in more early according to the channel estimating strategy of an example embodiment of the present invention, that is, press PRB's and PRB between channel estimating between self adaptation.Note, in Figure 5, only considered 6 PRB, but this is optional.
Mentioned by more early, criterion can based on the continuity keeping CSI between adjacent several PRB.This is by be distributed to PRB in a group and to perform channel estimating between PRB otherwise perform to have come by the channel estimating of PRB.With reference to the example of continuity criterion shown in Fig. 6, figure, it considers 6 PRB.As previously described,
represent PRB#
k+ 1 (
h k+ 1
) with PRB#k (
h k ) estimation channel coefficients between the difference that calculates, that is,
.In figure 6, difference is shown
,
,
,
and
.More each difference
and whether predefine CSI threshold value is continuous to determine the CSI between adjacent PRB, and perform marshalling before the channel estimation.As shown in the figure, organize #1 and comprise PRB1,2,3; And organize #2 and comprise PRB5 and 6, therefore, for organizing channel estimating between 1 and group 2 execution PRB, and PRB#4 experience presses the channel estimating of PRB.Should it is mentioned that, group size can be limited to fair amount PRB in case reduce realize complexity.This is because when organizing size and increasing too many, may less gain can be implemented.The group size be applicable to such as can comprise maximum 6 PRB.But, it should be noted that example embodiment of the present invention is not limited to only 6 PRB.
As mentioned above, by example embodiment of the present invention, low-complexity can be realized and realize.With reference to low-complexity how can be realized according to an example embodiment of the present invention shown in Fig. 7, figure realize.As shown in the figure, the difference of the channel coefficients estimated by belt edge is only considered.Each PRB show for comprise be composed of index 1,2,3 ..., 12 12 daughter elements.For PRB#k, estimate separating continuous P RB# respectively
kand PRB#
k+ 1 and PRB#
kand PRB#
kthe channel coefficients of the belt edge of-1, and they are expressed as
h k, 1
with
h k, 12
.For PRB#
k+ 1, estimate the channel coefficients in belt edge, namely
h k+ 1,1
with
h k+ 1,12
.Arrow index strip edge in Fig. 7.
With reference to Fig. 8 A-8B, expand Typical Urban at two kinds of ETU(shown in figure) in situation for (namely layer beam forms execution adaptive channel estimation, change between the channel estimating by PRB's and between PRB) time Performance Evaluation (, emulation), in the first situation (Fig. 8 A), the speed of UE is 3km/h, and in second case (Fig. 8 B), the speed of UE is 120km/h.It is also the performance that two kinds of situations illustrate perfect channel estimation.Which curve is legend in respective graphical indicate relevant with perfect channel estimation, and which curve is estimated relevant with the realistic channels for ETU situation, and which curve is relevant with the adaptive channel estimation for ETU situation.Emulating display as SNR(in units of dB) the BLER(block error rate of function).Through emulation, use the precoding granularity of 4 PRB.In addition, the UE channel estimator of use uses two-dimentional MMSE filter (2D-MMSE) based on the criterion of least mean-square error (MMSE).In addition, consider 3 kinds of modulation schemes: QPSK(Quadrature Phase Shift Keying), 16QAM(quadrature amplitude modulation) and 64QAM; And be the same-code speed that the application of all modulation schemes equals 1/2.As shown in the figure, regardless of ETU situation, perfect channel estimation and the realistic channels by PRB estimate between gap be large.Fig. 8 A-8B centre circle has shown gap.Modulation scheme is higher, and the mobility of subscriber equipment or speed higher, gap is larger.This is because such as 64QAM etc. more high modulation is more responsive to channel errors.In assessment, PRB group size is limited to 2, this means as channel estimating between PRB at most can by two adjacent PRB marshallings.In addition, 8x2MIMO is considered.Adaptive channel estimation example embodiment noted earlier according to the present invention performs.
Execution result shows, and adaptive channel estimation obviously improves performance, that is, its improves demodulation performance, particularly for more high-order scheme, such as, and 64QAM.As shown in the figure, in Fig. 8 A and Fig. 8 B, represent that the curve of adaptive channel estimation is closer to the curve that perfect channel estimation is shown, and regardless of the ETU situation used, also regardless of the modulation scheme used.This means, according to compared with the static channel estimating by PRB of the adaptive channel estimation of example embodiment of the present invention and prior art, to improve demodulation performance.Such as, when 64QAM and 120km/hETU situation, 10
-1(that is, 10%) BLER can obtain 2dB gain, and effectively can overcome error background (floor).Therefore, wherein perform adaptive channel estimation (that is, by PRB with the channel estimating between PRB) if the relevant advantage of example embodiment of the present invention be and use only compared with the static channel estimating by PRB, improve demodulation performance.This also means that channel estimation accuracy is improved.In addition, due to based on continuity criterion, PRB is distributed in several groups, realizes so obtain low-complexity.In addition, achieve and to change and without the need to any control signal from radio base station from the self adaptation the channel estimating between PRB of group to group and the channel estimating by PRB.Should it is mentioned that, example embodiment of the present invention can realize in the downlink and in the uplink in the system based on code book and/or non-code book, wherein uses PRB channel estimating.
Fig. 9 summarises the key step of method/process that embodiment noted earlier according to the present invention is performed by subscriber equipment.As shown in the figure, these key steps comprise:
(901) multiple continuous P RB is received from radio base station;
(902) channel coefficients of each PRB is estimated;
(903) for every two adjacent PRB calculate the difference between the channel coefficients estimated between these two adjacent PRB;
(904) difference of more each calculating and predefine threshold value;
(905) its difference will be less than or equal to the PRB marshalling of predefine threshold value; And
(906) in group, perform (that is, between PRB) channel estimating in groups, and perform the channel estimating of pressing PRB on each residue PRB.
According to an example embodiment of the present invention, the estimating step of above-mentioned numbering (902) is included in the channel coefficients that each belt edge separating continuous P RB estimates the PRB of each reception.In addition, the receiving step of above-mentioned numbering (901) comprises the continuous P RB received by the non-codebook precoding device institute precoding of radio base station.
According to another example embodiment of the present invention, the estimating step of above-mentioned numbering (902) comprises the channel coefficients of the PRB estimating each reception, and described channel coefficients corresponds to the channel condition information (CSI) of the PRB of each reception.
The other details relevant with the function of UE describes in detail comprehensively, therefore no longer repeats.
The present invention and embodiment can realize in many ways.Such as, one embodiment of the present of invention comprise computer and can use or computer-readable media, and described media comprise and are configured to impel processor to perform the computer program code of the instruction stored in the media.Executable instruction perform as previously described and as accompanying method claim the method step of the present invention that proposes.
Note, although the present invention describes according to several example embodiment, expect that it is alternative at reading specification with after research figure, amendment, displacement and equivalently will become obvious.Therefore, claim of below enclosing is intended to comprise falling that within the scope of the invention this type of is alternative, amendment, displacement and equivalent.
Claims (14)
1. the user equipment (UE) for channel estimating in wireless communication network system (400), described UE (400) comprises the transceiver (405) being configured to receive multiple continuous physical Resource Block from radio base station; Described UE (400)
be characterised in thatit also comprises:
-channel estimator (405A), is configured to the channel coefficients estimating each reception Physical Resource Block;
-computer circuits (405B), is configured to, and is the difference between the channel coefficients that every two contiguous physical Resource Block calculate the estimation of these two contiguous physical Resource Block;
-comparator circuit (405C), is configured to difference and the predefine threshold value of more each calculating;
-assembler circuit (405D), is configured to be less than or equal to the Physical Resource Block marshalling of described predefine threshold value for the difference calculated described in it;
-described channel estimator (405A) is also configured to the channel estimating performed in the group comprising the Physical Resource Block difference calculated described in it being less than or equal to described predefine threshold value in groups, and on each residue Physical Resource Block, also perform the channel estimating of pressing Physical Resource Block.
2. UE (400) as claimed in claim 1, wherein said channel estimator (405A) is configured to the channel coefficients of each reception Physical Resource Block estimated in each belt edge separating continuous physical Resource Block.
3. UE as claimed in claim 1 or 2, wherein said transceiver (405) is configured to receive the Physical Resource Block by the non-codebook precoding device institute precoding of described radio base station.
4. the UE (400) as described in any one of claim 1-2, wherein said channel estimator (405A) is configured to the channel coefficients estimating each reception Physical Resource Block corresponding with the channel condition information of each reception Physical Resource Block.
5. the UE (400) as described in any one of claim 1-2, wherein belongs to each Physical Resource Block being less than or equal to the group of predefine threshold value for difference described in it and belongs to identical precoder, and remains the precoder that Physical Resource Block belongs to different.
6. the UE (400) as described in any one of claim 1-2 is the UE based on MIMO.
7. in user equipment (UE) (400) for a method for the channel estimating in wireless communication network system, described method comprises:
-receive (901) multiple continuous physical Resource Block from radio base station; Described method
be characterised in thatit also comprises:
The channel coefficients of-estimation (902) each reception Physical Resource Block;
-calculate the estimation of (903) these two contiguous physical Resource Block for every two contiguous physical Resource Block channel coefficients between difference;
-compare (904) each difference and predefine threshold value;
-difference described in it will be less than or equal to Physical Resource Block marshalling (905) of described predefine threshold value;
-comprising execution (906) channel estimating in groups in group difference described in it being less than or equal to the Physical Resource Block of described predefine threshold value, and on each residue Physical Resource Block, perform (906) channel estimating by Physical Resource Block.
8. method as claimed in claim 7, wherein estimates that (902) comprise the channel coefficients of each reception Physical Resource Block estimated in each belt edge separating continuous physical Resource Block.
9., as claim 7 or method according to claim 8, wherein receive (901) and comprise the continuous physical Resource Block received by the non-codebook precoding device institute precoding of described radio base station.
10. the method as described in any one of claim 7-8, wherein estimates that (902) comprise the channel coefficients estimating each reception Physical Resource Block corresponding with the channel condition information of each reception Physical Resource Block.
11. 1 kinds in user equipment (UE) (400) for the device of the channel estimating in wireless communication network system, described device comprises:
-for receiving the parts of multiple continuous physical Resource Block from radio base station;
Described device
be characterised in thatit also comprises:
-for estimating the parts of the channel coefficients of each reception Physical Resource Block;
-calculate the estimation of these two contiguous physical Resource Block for every two contiguous physical Resource Block channel coefficients between the parts of difference;
-for the parts of more each difference and predefine threshold value;
-for will for described in it difference be less than or equal to described predefine threshold value Physical Resource Block marshalling parts;
-for performing channel estimating in groups and perform the parts of the channel estimating by Physical Resource Block on each residue Physical Resource Block comprising in the group being less than or equal to the Physical Resource Block of described predefine threshold value for difference described in it.
12. devices as claimed in claim 11, the parts wherein for estimating comprise the parts of the channel coefficients for estimating each reception Physical Resource Block in each belt edge separating continuous physical Resource Block.
13. as claim 11 or device according to claim 12, wherein comprises for receiving by the parts of the continuous physical Resource Block of the non-codebook precoding device institute precoding of described radio base station for receiving-member.
14. devices as described in any one of claim 11-12, the parts wherein for estimating comprise the parts of the channel coefficients for estimating each reception Physical Resource Block corresponding with the channel condition information of each reception Physical Resource Block.
Applications Claiming Priority (1)
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|---|---|---|---|
| PCT/CN2009/001367 WO2011066671A1 (en) | 2009-12-04 | 2009-12-04 | Apparatus and method for channel estimation in a wireless communications system |
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| EP (1) | EP2507960B1 (en) |
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| US10873375B2 (en) * | 2006-03-20 | 2020-12-22 | Texas Instruments Incorporated | Pre-coder selection based on resource block grouping |
| US10044489B2 (en) * | 2010-10-22 | 2018-08-07 | Nokia Solutions And Networks Oy | Enhanced inter-network access node scheduling coordination and signaling support for advanced receiver algorithms |
| CN102244563B (en) * | 2011-07-08 | 2013-07-24 | 电信科学技术研究院 | Method, device and system for transmitting and receiving data |
| US9503924B2 (en) | 2013-01-18 | 2016-11-22 | Qualcomm Incorporated | Interpolation-based channel state information (CSI) enhancements in long-term evolution (LTE) |
| CN103973601B (en) * | 2013-01-25 | 2017-04-26 | 中兴通讯股份有限公司 | Channel estimation method and device for downlink data transmission |
| US9231667B2 (en) * | 2013-02-22 | 2016-01-05 | Futurewei Technologies, Inc. | Systems and methods for a long-term evolution network |
| US9019858B2 (en) | 2013-02-22 | 2015-04-28 | Nokia Solutions And Networks Oy | Generating short term base station utilization estimates for wireless networks |
| US9755810B2 (en) * | 2013-04-12 | 2017-09-05 | Qualcomm Incorporated | Precoder resource bundling information for interference cancellation in LTE |
| US10462705B1 (en) * | 2015-05-13 | 2019-10-29 | Sprint Spectrum L.P. | Systems and methods for preventing premature processing during beam forming |
| WO2017107002A1 (en) * | 2015-12-21 | 2017-06-29 | Orange | Method and device for beamforming |
| CN109150269B (en) | 2017-06-16 | 2021-11-26 | 华为技术有限公司 | Signaling receiving method, indication method, terminal, network equipment and storage medium |
| TWI717736B (en) * | 2019-05-15 | 2021-02-01 | 財團法人工業技術研究院 | Multi-antenna system and channel calibration method thereof |
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| Publication number | Publication date |
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| WO2011066671A1 (en) | 2011-06-09 |
| EP2507960A1 (en) | 2012-10-10 |
| EP2507960B1 (en) | 2018-06-06 |
| EP2507960A4 (en) | 2017-07-26 |
| CN102726016A (en) | 2012-10-10 |
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| US8804563B2 (en) | 2014-08-12 |
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